Charts
Pulls the most recent measurement of every site (excluding starter projects). Tooltips are only shown on green (well scoring) data points.
Page Weight vs LCP 1,650 sites r = 0.78
JavaScript Weight vs LCP 1,650 sites r = 0.60
TTFB vs LCP 1,649 sites r = 0.04
Web Font Weight vs CLS 1,652 sites r = -0.01
Performance vs Third Party 1,648 sites r = -0.59
Lighthouse’s Performance score weighed against third-party weight — usually things like analytics, embeds, fonts, tag managers, ads.
Performance vs DOM Elements 1,643 sites r = -0.51
Lighthouse’s Performance score against DOM element count. A big document is paid for in style and layout work on every frame.
Company Size vs LCP 35 companies r = 0.29
Big Tech, Web Hosts and Website Builders only — the categories where “how many people work here” has an answer. Headcount comes from each company’s own filings and disclosures. One dot per company, using its canonical site. A further 13 companies are measured but not plotted, having published no headcount.
JavaScript Weight by Site Generator 1,011 sites
One row per generator, one dot per site, ordered by median.
Across 8 generators with at least five sites each: twenty more were detected too rarely in this data set.
Client Rendering by Generator 468 sites
Sites that painted nothing with scripts disabled, by the tool their page reports building it. One row per generator: a dot for how many of its sites were judged, a dot for how many came up blank, and a line joining them — so the length of the row is the size of the sample the finding came out of.
24 empty pre-JavaScript blank pages from 468 measured sites.
The other 22 generators flagged nothing across 335 judged sites between them — mostly on samples of a handful of sites each.
TTFB by Host 1,537 sites
Field vs Lab LCP 402 sites
One row per site, ordered by our throttled lab run: a dot for what the lab measured, a dot for what real users actually saw (Chrome’s field p75) and a line joining them. Sorting by the lab figure straightens it into a curve, and the field dots scatter across it.
The lab is slower than reality on 376 of these and faster on 25.